Sea Urchin

From Zelda Wiki.org

Sea Urchin
Game(s)	Link's Awakening
Habitat(s)	Seashore
Effective Weapons	Shield, Boomerang

Sea Urchins are spiked animals living around the shores of Koholint Island. They can be passed by pushing them with the shield. You can also use the sword or Boomerang to destroy them.

The Sea Urchin is another Mario reference, seeing how it looks nearly identical to the Sea Urchins in Super Mario World.